If f ' x = tan - 1 ⁡ sec ⁡ x + tan ⁡ x , - π 2 < x < π 2 and f 0 = 0…

If f'x=tan-1secx+tanx,-π2<x<π2 and f0=0 , then f1 is equal to:
  1. π+14
  2. 14
  3. π-14
  4. π+24

Solution

f'x=tan-1secx+tanx=tan-11+sinxcosx=tan-11-cosπ2+xsinπ2+x

f'(x)=tan-12sin2π4+x22sinπ4+x2cosπ4+x2

f'xdx=π4+x2dx

fx=π4x+x24+c

f0=0c=0

So, f1=π+14

Asked in: JEE Main 2020 (09 Jan Shift 1)

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